REM Sleep – Dreams & Memory

REM sleep (Rapid Eye Movement sleep) is the stage where dreaming happens and your brain is highly active. REM usually makes up about 20–25% of the night, with longer REM periods occurring toward the morning.

What Happens in REM Sleep?

Eyes move rapidly beneath closed eyelids — the hallmark of REM sleep.
Brain activity becomes almost as active as when you’re awake.
Most dreams occur during REM sleep.
Muscle activity is temporarily suppressed (atonia) to prevent acting out dreams.
Heart rate, blood pressure, and breathing become irregular and variable.

Why REM Sleep Matters

REM is essential for memory consolidation, learning, and emotional processing. Without enough REM sleep, people may struggle with focus, creativity, and mood stability. REM also supports brain development, especially in infants and children.

REM Sleep and Your Nightly Cycles

Each 90-minute cycle ends in a REM stage, but the duration of REM grows longer with each cycle. The first REM stage may last only 5–10 minutes, while the final one before waking can last up to an hour.

Tips for Healthy REM Sleep

Maintain a regular sleep schedule — going to bed and waking at consistent times helps regulate REM cycles.
Avoid alcohol and nicotine, both of which can suppress REM sleep.
Reduce stress through relaxation practices, as high stress can disrupt REM quality.

Learn More About the Sleep Stages

REM is the most active sleep stage, but it works together with the others to restore your body and mind. Explore the rest here: